package com.teach;

/**
 * <pre>
 * -
 * Author : J.L.Zhou
 * E-Mail : 2233875735@qq.com
 * Tel : 151 1104 7708
 * Date : 2021-04-12 15:44
 * Version : 1.0
 * Copyright 2021 jlzhou.top Inc. All rights reserved.
 * Warning: this content is only for internal circulation of the company.
 *          It is forbidden to divulge it or use it for other commercial purposes.
 * </pre>
 **/
public class Demo02 {

  public static void main(String[] args) {
    String a = "aa";
    String b = new String("bb");
//    a = a+b;
    String c = a+b;
    String d = a.concat(b);
    System.out.println(a);
    System.out.println(b);
    System.out.println(c);
    System.out.println(d);
  }
}
